Federal authorities announced Friday the dismantling of a large trafficking operation that distributed methamphetamine throughout several rural North Texas counties.

Thirty-two people have been charged with drug trafficking and conspiracy, and all but one were in custody Friday, the U.S. attorney’s office said.

Police arrested 20 of the suspects Thursday, the office said. Eleven others were already in custody on unrelated state charges.

The investigation into what authorities called the Brittany Barron Drug Trafficking Organization, based in Stephenville, west of Fort Worth, began last December, the office said. Police learned of more than 100 people who were selling for or buying from that drug organization.

Hundreds of pounds of methamphetamine were being sold in primarily rural Texas counties, including Comanche, Eastland, Erath, Hamilton, Hood, Palo Pinto, Parker, Somervell, Stephens and Taylor, the U.S. attorney’s office said.

During their investigation, police used undercover drug buys and search warrants and seized large amounts of methamphetamine and cash, authorities said.

Several suppliers of the drug-trafficking group also were dismantled, the office said, and others are under investigation.

The operation was led by the Drug Enforcement Administration and the Stephenville Police Department. Many other agencies assisted, including the Erath, Parker, Palo Pinto and Stephens County sheriff’s offices; Fort Worth and Weatherford police; the Erath County district attorney’s office; the U.S. Marshals Service; and the Texas Department of Public Safety.